I downloaded and tried a number of these converters. The BEST one I could find was by a company called CUCUSOFT. It will actually even crop the black bars at the top and bottom of a widescreen video properly. I recommend it!2 Very Very Good applications ... Kinda like the phrase you get the best bang for the buck... imToo iPhone Converter its 2 applications in one purchase DVD to iPhone and many different video formats to iPhone format and settings can be changed aswell quality wise... you can choose from low medium high and high quality.. ImToo is known for their applications they have many and a good repuation..
also Nidesoft iPhone Converter is good aswell but then again everyone has their favorites